Home
Class 12
PHYSICS
The wire of potentiometer has resistance...

The wire of potentiometer has resistance `4Omega` and length `1m`. It is connected to a cell of emf 2 volt and internal resistance `1Omega`. If a cell of emf 1.2 volt is balanced by it, the balancing length will be

A

`90 cm`

B

`60 cm`

C

`50 cm`

D

`75 cm`

Text Solution

Verified by Experts

The correct Answer is:
D
`V_(AC)=V_(DE)`
`i(R_(AC))=E=1.2`
`:. (2/(4+1))(4/100)xx l)=1.2`
Solving this equations we get
`l=75 cm`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise OBJECTIVE_TYPE|1 Videos

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Level 1 Subjective|53 Videos

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Level 1 Assertion And Reason|11 Videos

  • COMMUNICATION SYSTEM

    DC PANDEY|Exercise Subjective|11 Videos

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Medical entrances gallery|25 Videos

Similar Questions

Explore conceptually related problems

The wire of potentiometer has resistance 4Omega and length Im. It is connected to a cell of EMF 2V and internal resistance 1Omega . Ifa cell ofEMF 1.2V is balanced byit, the balancing length will be:

The wire of potentiometer has resistance 4 Omega and length 1m. It is connected to a cell of e.m.f. 2V and internal resistance 1 Omega . The current flowing through the potentiometer wire is

A wire of length 1.6m has a resistance 8 Omega is connected to a battery of 2 volts and internal resistance 2Omega . What is the potential gradient ?

A potentiometer wire has length 10m and resistance 10Omega . It is connected to battery of EMF 11 volt and internal resistance 1Omega , then the potential gradient in the wire is

A resistance of 4 Omega and a wire of length 5 meters and resistance 5 Omega are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1 Omega . A parallel combination of two identical cells is balanced across 300 cm of wire. The e.m.f. E of each cell is

A potentiometer wire of lengthh 100 cm has resistance 5Omega . It is connected in series with a resistance and a cell of emf 2 v and of negligible internal resistance. A source of emf 5 mv balanced by 10 cm length of potentiometer wire. The value of external resistance is___

The length of the potentiometer wire is 600 cm and a current of 40 mA is flowing in it. When a cell of emf 2 V and internal resistance 10Omega is balanced on this potentiometer the balance length is found to be 500 cm. The resistance of potentiometer wire will be

A potentiometer wire of length 1000 cm has a resistance of 10 ohms. It is connected in series with a resistance and a cell of e.m.f 2 volts and of negligible internal resistance. A source of e.m.f 10 millivolts is balanced against a length of 40 cm of the potentiometer wire. What is the value of the external resistance?

DC PANDEY-CURRENT ELECTRICITY-Level 1 Objective
  1. A copper wire of resistance R is cut into ten parts of equal length. T...

    Text Solution

    |

  2. Two resistances are connected in two gaps of a meter bridge. The balan...

    Text Solution

    |

  3. In the given circuit, the voltmeter records 5 volt. The resistance of ...

    Text Solution

    |

  4. The wire of potentiometer has resistance 4Omega and length 1m. It is c...

    Text Solution

    |

  5. The potential difference between points A and B, in a section of a cir...

    Text Solution

    |

  6. Two identical batteries, each of emf 2V and internal resistance r=1Ome...

    Text Solution

    |

  7. For a cell, the terminal potential difference is 2.2 V, when circuit i...

    Text Solution

    |

  8. Potentiometer wire of length 1 m is connected in series with 490 Omega...

    Text Solution

    |

  9. Find the ratio of currents as measured by ammeter in two cases when th...

    Text Solution

    |

  10. A galvanometer has a resistance of 3663Omega. A shunt S is connected a...

    Text Solution

    |

  11. The network shown in figure is an arrangement of nine identical resist...

    Text Solution

    |

  12. The equivalent resistance of the hexagonal network as shown figure be...

    Text Solution

    |

  13. A uniform wire of resistance 18 Omega is bent in the form of a circle....

    Text Solution

    |

  14. Each resistor shown in figure is an infinite network of resistance1Ome...

    Text Solution

    |

  15. In the circuit shown in figure the total resistance between points A a...

    Text Solution

    |

  16. In the circuit shown in figure R=55 Omega the equivalent resistance be...

    Text Solution

    |

  17. The resistance of all the wires between any two adjacent dots is R. Th...

    Text Solution

    |

  18. A uniform wire of resistance 4Omega is bent into circle of radius r. ...

    Text Solution

    |

  19. In the network shown in figure, each resistance is R. The equvalent r...

    Text Solution

    |

  20. The equivalent resistance between the points A and B is (R is the resi...

    Text Solution

    |